** Shell's UK-listed shares up 3 pct afterthe oil major reported market-beating Q2 profit
** Co plans to cut 6,500 jobs, reduce spending and sellassets to deal with continued lower oil price
** Co's dual-class shares top gainers on the bluechip FTSE100 index and the STOXX Europe 600 oil and gas index
** Co says on track to complete its $70 billion acquisitionof BG Group early next year
** The combined co will be the world's leading LNG co andone the largest deepwater oil producers
** BG shares also up about 2 pct at 1063.9 pence, withnearly a full day's average volume traded in the first hour anda half, and third biggest FTSE 100 gainer
** Shell and BG shares the biggest boosts on the FTSE Thursday morning
** BG reports Q2 earnings on July 31 (abhiram.nandakumar.thomsonreuters.com@reuters.net)